#!/bin/sh 

myname=`basename $0`
cwd=`pwd`

make_initrd()
{
	template=$1
	modules_dir=$2
	uname_r=$3
	target=$4

	dir=`mktemp -d "/tmp/$myname""_XXXXXX"`

	mkdir $dir/source

	cat $1 | (cd $dir/source; gunzip | cpio -i)
	cp -rp $dir/source $dir/target
	rm -rf $dir/target/lib/modules/*

	(
		cd $dir/source
		find . -name '*.ko'
	) | while read tmpl_relpath; do

		mod_name=`basename $tmpl_relpath`
		source_mod=`cd $modules_dir; find . -name $mod_name`

		if [ ! "$source_mod" ]; then
			echo "warning: module $mod_name not found in $modules_dir" >&2
		#	exit 1
		else
			mod_relpath=`dirname $source_mod`
			target_path=$dir/target/lib/modules/$uname_r/$mod_relpath
			echo "copying $mod_name from $mod_relpath to $target_path"
			mkdir -p $target_path
			cp -p $modules_dir/$source_mod $target_path
			
		fi
	done

	(cd $dir/target; find . | cpio -co) | gzip -9 > $target

	rm -rf $dir
}

config_section()
{
	output_file=
	add_boot_dir=
	add_modules_basedir=
	root_dev=
	initrd_template=
        sed -n "/\[$2\]/,/\[/ p" $1 | sed '/]/ d; s/#.*//; /./ !d; s/ *= */=/; s/=\(.*\)/="\1"/'
}

boot_sections()
{
	sed '/\[boot\..*\]/ !d; s/\[boot\.//; s/\].*//' $1
}


name_filter()
{
	echo $1 | tr [A-Z] [a-z] | sed 's/\.tar\.gz/.tgz/; s/-/_/g; s/\([^.]*\)\.\([^.]*\)$$/\1@\2/; s/\./_/g; s/@/./'
}

#make_initrd $template $modules_dir

set -- `getopt 'f:o:d:' $*`

while [ "$1" != -- ]; do
	case $1 in
		-f)
			opt_config_file="$2"
			shift
			;;
		-o)
			opt_output_file="$2"
			shift
			;;
		-d)
			opt_build_dir="$2"
			boot_dir="$2"
			shift
			;;
		*)
			usage;
	esac
	shift
done
shift

if [ ! "$opt_build_dir" ]; then
	boot_dir=`mktemp -d "/tmp/$myname""_XXXXXX"`
fi

eval `config_section $opt_config_file global`

echo DEFAULT menu.c32 > $boot_dir/isolinux.cfg
echo PROMPT 0 >> $boot_dir/isolinux.cfg

for sec in `boot_sections $opt_config_file`; do

	echo "+ processing section boot.$sec"
	eval `config_section $opt_config_file boot.$sec`

	if [ "$add_boot_dir" ]; then

		echo "+ adding boot directory $add_boot_dir"
		for f in $add_boot_dir/*; do
			b=`basename $f`
			n=`name_filter $b`
			echo "+ copying $f -> $n"
			cp -p $f $boot_dir/$n
		done

		kernels=`file $add_boot_dir/* | grep -ie 'linux.*kernel' | sed 's/:.*//'`
		for kernel in $kernels; do

			kernel_version=`basename $kernel | sed 's/vmlinuz-//'`
			kernel_version_iso=`name_filter $kernel_version | cut -b1-21`

			echo "+ processing kernel $kernel (version $kernel_version)"

			# create initrd
			if [ "$initrd_template" ]; then
				echo "+ creating initial ram disk from template $initrd_template"
				make_initrd $initrd_template $add_modules_basedir/$kernel_version $kernel_version $boot_dir/initrd_$kernel_version_iso
			fi

			# create isolinux.cfg
			echo "LABEL $kernel_version" >> $boot_dir/isolinux.cfg
			echo "KERNEL vmlinuz_$kernel_version_iso" >> $boot_dir/isolinux.cfg
			echo "APPEND initrd=initrd_$kernel_version_iso root=$root_dev" >> $boot_dir/isolinux.cfg
		done
	fi
done

cp $* $boot_dir

mkisofs -l --iso-level 2 -o $opt_output_file \
	-b isolinux.bin -c boot.cat \
	-no-emul-boot -boot-load-size 4 -boot-info-table \
	$boot_dir

if [ ! "$opt_build_dir" ]; then
	rm -rf $boot_dir
fi